package imoocECDA;

import java.awt.HeadlessException;

import java.security.KeyFactory;

import java.security.KeyPair;

import java.security.KeyPairGenerator;

import java.security.KeyStore.PrivateKeyEntry;

import java.security.PrivateKey;

import java.security.PublicKey;

import java.security.Signature;

import java.security.interfaces.ECPrivateKey;

import java.security.interfaces.ECPublicKey;

import java.security.spec.ECPrivateKeySpec;

import java.security.spec.PKCS8EncodedKeySpec;

import java.security.spec.X509EncodedKeySpec;

import javax.xml.bind.annotation.adapters.HexBinaryAdapter;

public class ImoocECDSA {

private static String src="imooc security ecdsa";

public static void main(String[] args) {

jdkECDSA();

}

public static void jdkECDSA(){

try {

//初始化密鑰

KeyPairGenerator keyPairGenerator=KeyPairGenerator.getInstance("EC");

keyPairGenerator.initialize(256);

KeyPair keyPair = keyPairGenerator.generateKeyPair();

ECPublicKey ecPublicKey=(ECPublicKey)keyPair.getPublic();

ECPrivateKey ecpPublicKey=(ECPrivateKey)keyPair.getPrivate();

//執行簽名

PKCS8EncodedKeySpec pkcs8EncodedKeySpec=new PKCS8EncodedKeySpec(ecpPublicKey.getEncoded());

KeyFactory keyFactory=KeyFactory.getInstance("EC");

PrivateKey privateKey=keyFactory.generatePrivate(pkcs8EncodedKeySpec);

Signature signature=Signature.getInstance("SHA1withECDSA");

signature.initSign(privateKey);

signature.update(src.getBytes());

byte[] result=signature.sign();

System.out.println("jdk ecdsa sign:"+Hex.encodeHexString(result));

//驗證

X509EncodedKeySpec x509EncodedKeySpec=new X509EncodedKeySpec(ecpPublicKey.getEncoded());

keyFactory=KeyFactory.getInstance("EC");

PublicKey publicKey=keyFactory.generatePublic(x509EncodedKeySpec);

signature.initVerify(publicKey);

signature.update(src.getBytes());

boolean bool=signature.verify(result);

System.out.println("jdk ecdsa verify:"+bool);

} catch (Exception e) {

e.printStackTrace();

}

}

}

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